GUACAMOLE-44: Replace use of ManagedFileDownload with calls to the tunnel REST service.

guacamole/src/main/webapp/app/client/controllers/clientController.js

@@ -755,7 +755,7 @@ angular.module('client').controller('clientController', ['$scope', '$routeParams
         if (!$scope.client)
             return false;
 
-        return !!($scope.client.uploads.length || $scope.client.downloads.length);
+        return !!$scope.client.uploads.length;
 
     };